Definition
JSON extraction is the process of obtaining structured data in JSON (JavaScript Object Notation) format from web sources. This includes parsing JSON from API responses, extracting embedded JSON-LD from HTML pages, and converting unstructured web content into JSON output that conforms to a desired schema.
Sources of JSON on the Web
API Responses
Many websites fetch their data from backend APIs that return JSON. Identifying and calling these APIs directly is often more efficient than parsing rendered HTML. Network inspection tools reveal these endpoints, which typically return clean, well-structured data.
Embedded JSON-LD
Websites that implement schema.org markup often include JSON-LD blocks in their HTML. These contain structured descriptions of products, articles, organizations, events, and other entities — ready to parse without any HTML processing.
JavaScript Variables
Some pages store data in JavaScript variables or window.__INITIAL_STATE__ objects that are embedded in script tags. Extracting these provides access to the raw data the page uses to render its content.
Inline JSON in HTML Attributes
Data attributes (data-product-info='{"id": 123, ...}') sometimes contain JSON that can be extracted from the HTML.
JSON Extraction Techniques
Direct API Access
When you can identify the underlying API, calling it directly yields clean JSON without any parsing overhead. This is the most reliable extraction method but requires reverse-engineering the API endpoints and authentication.
HTML Parsing + JSON Extraction
Parse the HTML to locate <script type="application/ld+json"> tags or script blocks containing JSON data, then parse the JSON content.
Schema-Based Conversion
The most flexible approach: transform arbitrary web content into JSON matching a predefined schema, regardless of the original format.
JSON Extraction with ScrapeGraphAI
ScrapeGraphAI specializes in producing clean JSON output from any web page. You provide a schema defining the structure you need, and the platform's AI extracts matching data from the page content. The result is valid, typed JSON ready for direct consumption by your application — no post-processing required.